pia mater /pīˈə māˈtər/ (anatomy)

1. The vascular membrane surrounding the brain and spinal cord
2. The brain (Shakespeare)

• sleep mode
• sleep modes
• sleep off
• sleep on
• sleep out
• sleepout
• sleepouts
• sleep over
• sleepover
• sleep rough
• sleepry
• sleeps
• sleepsuit
• sleep together
• sleepwalk
• sleepwalked
• sleepwalker
• sleepwalkers
• sleepwalking
• sleepwalkings
• sleepwalks
• sleep with
• sleepy
• sleepyhead
• sleepyheads